"Taking into account all taxes on earnings and consumer spending—including federal, state and local income taxes, Social Security and Medicare payroll taxes, excise taxes, and state and local sales taxes—Edward Prescott has shown (especially in the Quarterly Review of the Federal Reserve Bank of Minneapolis, 2004) that the U.S. average marginal effective tax rate is around 40%. This means that if the average worker earns $100 from additional output, he will be able to consume only an additional $60.

Research by others (including Lee Ohanian, Andrea Raffo and Richard Rogerson in the Journal of Monetary Economics, 2008, and Edward Prescott in the American Economic Review, 2002) indicates that raising tax rates further will significantly reduce U.S. economic activity and by implication will increase tax revenues only a little.

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In the 1950s, when European tax rates were low, many Western Europeans, including the French and the Germans, worked more hours per capita than did Americans. Over time, tax rates that affect earnings and consumption rose substantially in much of Western Europe. Over the decades, these have accounted for much of the nearly 30% decline in work hours in several European countries—to 1,000 hours per adult per year today from around 1,400 in the 1950s.

Changes in tax rates are also important in accounting for the increase in the number of hours worked in the Netherlands in the late 1980s, following the enactment of lower marginal income-tax rates.

In Japan, the tax rate on earnings and consumption is about the same as it is in the U.S., and the average Japanese worker in 2007 (the last nonrecession year) worked 1,363 hours—or about the same as the 1,336 worked by the average American.

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Entrepreneurship is much lower in Europe, suggesting that high tax rates and poorly designed regulation discourage new business creation. The Economist reports that between 1976 and 2007 only one continental European startup, Norway's Renewable Energy Corporation, achieved a level of success comparable to that of Microsoft, Apple and other U.S. giants making the Financial Times Index of the world's 500 largest companies."

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